Buggy code:
private static final char [ ] SEMICOLON = new char [ ] { ';' } ; private static final int SUPERTYPE = 1 ; private static final int SUBTYPE = 2 ; private static final int FIELD = 0 ; private static final int LOCAL = 1 ; private static final int ARGUMENT = 2 ; int expectedTypesPtr = - 1 ; TypeBinding [ ] expectedTypes = new TypeBinding [ 1 ] ; int expectedTypesFilter ; int uninterestingBindingsPtr = - 1 ; Binding [ ] uninterestingBindings = new Binding [ 1 ] ; boolean assistNodeIsClass ; boolean assistNodeIsException ; boolean assistNodeIsInterface ; IJavaProject javaProject ; CompletionParser parser ; ICompletionRequestor requestor ; ProblemReporter problemReporter ; char [ ] source ; char [ ] token ; boolean resolvingImports = false ; boolean insideQualifiedReference = false ; boolean noProposal = true ; IProblem problem = null ; int startPosition ; int actualCompletionPosition ; int endPosition ; int offset ; HashtableOfObject knownPkgs = new HashtableOfObject ( 10 ) ; HashtableOfObject knownTypes = new HashtableOfObject ( 10 ) ; Scanner nameScanner ; static final char [ ] [ ] baseTypes = new char [ ] [ ] { "boolean" . toCharArray ( ) , "byte" . toCharArray ( ) , "char" . toCharArray ( ) , "double" . toCharArray ( ) , "float" . toCharArray ( ) , "int" . toCharArray ( ) , "long" . toCharArray ( ) , "short" . toCharArray ( ) , "void" . toCharArray ( ) } ; static final char [ ] classField = "class" . toCharArray ( ) ; static final char [ ] lengthField = "length" . toCharArray ( ) ; static final char [ ] THIS = "this" . toCharArray ( ) ; static final char [ ] THROWS = "throws" . toCharArray ( ) ; static InvocationSite FakeInvocationSite = new InvocationSite ( ) { public boolean isSuperAccess ( ) { } public boolean isTypeAccess ( ) { } public void setActualReceiverType ( ReferenceBinding receiverType ) { } public void setDepth ( int depth ) { } public void setFieldIndex ( int depth ) { } } ; public CompletionEngine ( ISearchableNameEnvironment nameEnvironment , ICompletionRequestor requestor , Map settings , IJavaProject javaProject ) { } public void acceptClass ( char [ ] packageName , char [ ] className , int modifiers ) { } public void acceptInterface ( char [ ] packageName , char [ ] interfaceName , int modifiers ) { } public void acceptPackage ( char [ ] packageName ) { } public void acceptType ( char [ ] packageName , char [ ] typeName ) { } private void complete ( AstNode astNode , AstNode astNodeParent , Binding qualifiedBinding , Scope scope ) { } public void complete ( IType type , char [ ] snippet , int position , char [ ] [ ] localVariableTypeNames , char [ ] [ ] localVariableNames , int [ ] localVariableModifiers , boolean isStatic ) { } private Initializer parseSnippeInitializer ( char [ ] snippet , int position , char [ ] [ ] localVariableTypeNames , char [ ] [ ] localVariableNames , int [ ] localVariableModifiers , boolean isStatic ) { } public void complete ( ICompilationUnit sourceUnit , int completionPosition , int offset ) { } private TypeBinding [ ] computeTypes ( Expression [ ] arguments , BlockScope scope ) { } private void findAnonymousType ( ReferenceBinding currentType , TypeBinding [ ] argTypes , Scope scope , InvocationSite invocationSite ) { } private void findClassField ( char [ ] token , TypeBinding receiverType , Scope scope ) { } private void findExplicitConstructors ( char [ ] name , ReferenceBinding currentType , MethodScope scope , InvocationSite invocationSite ) { } private void findConstructors ( ReferenceBinding currentType , TypeBinding [ ] argTypes , Scope scope , InvocationSite invocationSite , boolean forAnonymousType ) { } private void findFields ( char [ ] fieldName , FieldBinding [ ] fields , Scope scope , ObjectVector fieldsFound , ObjectVector localsFound , boolean onlyStaticFields , ReferenceBinding receiverType , InvocationSite invocationSite , Scope invocationScope , boolean implicitCall ) { } private void findFields ( char [ ] fieldName , ReferenceBinding receiverType , Scope scope , ObjectVector fieldsFound , ObjectVector localsFound , boolean onlyStaticFields , InvocationSite invocationSite , Scope invocationScope , boolean implicitCall ) { } private void findFieldsAndMethods ( char [ ] token , TypeBinding receiverType , Scope scope , InvocationSite invocationSite , Scope invocationScope , boolean implicitCall ) { } private void findImports ( CompletionOnImportReference importReference ) { } private void findKeywords ( char [ ] keyword , char [ ] [ ] choices ) { } private void findKeywordsForMember ( char [ ] token , int modifiers ) { char [ ] [ ] keywords = new char [ Keywords . COUNT ] [ ] ; int count = 0 ; if ( ( ( ( modifiers & ( CompilerModifiers . AccPrivate ) ) == 0 ) && ( ( modifiers & ( CompilerModifiers . AccProtected ) ) == 0 ) ) && ( ( modifiers & ( CompilerModifiers . AccPublic ) ) == 0 ) ) { keywords [ ( count ++ ) ] = Keywords . PROTECTED ; keywords [ ( count ++ ) ] = Keywords . PUBLIC ; if ( ( modifiers & ( CompilerModifiers . AccAbstract ) ) == 0 ) { keywords [ ( count ++ ) ] = Keywords . PRIVATE ; } } if ( ( modifiers & ( CompilerModifiers . AccAbstract ) ) == 0 ) { if ( ( modifiers & ( ~ ( ( CompilerModifiers . AccVisibilityMASK ) | ( CompilerModifiers . AccStatic ) ) ) ) == 0 ) { <START_BUG> keywords [ ( count ++ ) ] = ABSTARCT ; <END_BUG> } if ( ( modifiers & ( CompilerModifiers . AccFinal ) ) == 0 ) { keywords [ ( count ++ ) ] = Keywords . FINAL ; } if ( ( modifiers & ( CompilerModifiers . AccStatic ) ) == 0 ) { keywords [ ( count ++ ) ] = Keywords . STATIC ; } boolean canBeField = true ; boolean canBeMethod = true ; boolean canBeType = true ;

Fix:
keywords [ ( count ++ ) ] = Keywords . ABSTRACT ;